21521552300 has 18 divisors (see below), whose sum is σ = 46701768708. Its totient is φ = 8608620880.

The previous prime is 21521552293. The next prime is 21521552317. The reversal of 21521552300 is 325512512.

It is a self number, because there is not a number n which added to its sum of digits gives 21521552300.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107607662 + ... + 107607861.

It is an arithmetic number, because the mean of its divisors is an integer number (2594542706).

Almost surely, 2^21521552300 is an apocalyptic number.

21521552300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21521552300 is an abundant number, since it is smaller than the sum of its proper divisors (25180216408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21521552300 is a wasteful number, since it uses less digits than its factorization.

21521552300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215215537 (or 215215530 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 21521552300 in words is "twenty-one billion, five hundred twenty-one million, five hundred fifty-two thousand, three hundred".